Video footage of a dog attacking a shark under water has become an internet hit.
The footage shows two dogs swimming in the ocean near the West Australian town of Broome, about 1 650km northeast of Perth.
The dogs appear to be herding several sharks towards shore, when one suddenly ducks under the water and attacks a shark.
“The dog is biting the shark,” said Russell Hood-Penn in the voice-over as he video-taped the incident. “That is unbelievable. I've seen it all now.”